// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_WIDGET_WIDGET_H_
#define UI_VIEWS_WIDGET_WIDGET_H_

#include <set>
#include <stack>
#include <vector>

#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "uibase/accessibility/accessibility_types.h"
#include "uibase/ui_base_types.h"
#include "compositor/layer_type.h"
#include "gfx/native_widget_types.h"
#include "gfx/rect.h"
#include "views/focus/focus_manager.h"
#include "views/widget/native_widget_delegate.h"
#include "views/window/client_view.h"
#include "views/window/non_client_view.h"

#if defined(OS_WIN)
// Windows headers define macros for these function names which screw with us.
#if defined(IsMaximized)
#undef IsMaximized
#endif
#if defined(IsMinimized)
#undef IsMinimized
#endif
#if defined(CreateWindow)
#undef CreateWindow
#endif
#endif

namespace gfx {
class Canvas;
class Point;
class Rect;
}

namespace ui {
class Accelerator;
class Compositor;
class Layer;
class NativeTheme;
class OSExchangeData;
class ThemeProvider;
}

namespace views {

class DefaultThemeProvider;
class DesktopRootWindowHost;
class InputMethod;
class NativeWidget;
class NonClientFrameView;
class ScopedEvent;
class View;
class WidgetDelegate;
class WidgetObserver;

namespace internal {
class NativeWidgetPrivate;
class RootView;
}

////////////////////////////////////////////////////////////////////////////////
// Widget class
//
//  Encapsulates the platform-specific rendering, event receiving and widget
//  management aspects of the UI framework.
//
//  Owns a RootView and thus a View hierarchy. Can contain child Widgets.
//  Widget is a platform-independent type that communicates with a platform or
//  context specific NativeWidget implementation.
//
//  A special note on ownership:
//
//    Depending on the value of the InitParams' ownership field, the Widget
//    either owns or is owned by its NativeWidget:
//
//    ownership = NATIVE_WIDGET_OWNS_WIDGET (default)
//      The Widget instance is owned by its NativeWidget. When the NativeWidget
//      is destroyed (in response to a native destruction message), it deletes
//      the Widget from its destructor.
//    ownership = WIDGET_OWNS_NATIVE_WIDGET (non-default)
//      The Widget instance owns its NativeWidget. This state implies someone
//      else wants to control the lifetime of this object. When they destroy
//      the Widget it is responsible for destroying the NativeWidget (from its
//      destructor).
//
class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
                            public FocusTraversable {
 public:
  typedef std::set<Widget*> Widgets;

  enum FrameType {
    FRAME_TYPE_DEFAULT,         // Use whatever the default would be.
    FRAME_TYPE_FORCE_CUSTOM,    // Force the custom frame.
    FRAME_TYPE_FORCE_NATIVE     // Force the native frame.
  };

  // Result from RunMoveLoop().
  enum MoveLoopResult {
    // The move loop completed successfully.
    MOVE_LOOP_SUCCESSFUL,

    // The user canceled the move loop.
    MOVE_LOOP_CANCELED
  };

  struct VIEWS_EXPORT InitParams {
    enum Type {
      TYPE_WINDOW,      // A decorated Window, like a frame window.
                        // Widgets of TYPE_WINDOW will have a NonClientView.
      TYPE_PANEL,       // Always on top window managed by PanelManager.
                        // Widgets of TYPE_PANEL will have a NonClientView.
      TYPE_WINDOW_FRAMELESS,
                        // An undecorated Window.
      TYPE_CONTROL,     // A control, like a button.
      TYPE_POPUP,       // An undecorated Window, with transient properties.
      TYPE_MENU,        // An undecorated Window, with transient properties
                        // specialized to menus.
      TYPE_TOOLTIP,
      TYPE_BUBBLE,
    };

    enum Ownership {
      // Default. Creator is not responsible for managing the lifetime of the
      // Widget, it is destroyed when the corresponding NativeWidget is
      // destroyed.
      NATIVE_WIDGET_OWNS_WIDGET,
      // Used when the Widget is owned by someone other than the NativeWidget,
      // e.g. a scoped_ptr in tests.
      WIDGET_OWNS_NATIVE_WIDGET
    };

    InitParams();
    explicit InitParams(Type type);


    // Will return the first of the following that isn't NULL: the native view,
    // |parent|, |context|.
    gfx::NativeView GetContext() const;

    Type type;
    // If NULL, a default implementation will be constructed.
    WidgetDelegate* delegate;
    bool child;
    bool transient;
    // If true, the widget may be fully or partially transparent.  If false,
    // we can perform optimizations based on the widget being fully opaque.
    // For window widgets, defaults to ViewsDelegate::UseTransparentWindows().
    // Defaults to false for non-window widgets.
    bool transparent;
    bool accept_events;
    bool can_activate;
    bool keep_on_top;
    Ownership ownership;
    bool mirror_origin_in_rtl;
    bool has_dropshadow;
    // Only used by NativeWidgetWin. Specifies that the system default caption
    // and icon should not be rendered, and that the client area should be
    // equivalent to the window area.
    bool remove_standard_frame;
    // Only used by ShellWindow on Windows. Specifies that the default icon of
    // packaged app should be the system default icon.
    bool use_system_default_icon;
    // Whether the widget should be maximized or minimized.
    ui::WindowShowState show_state;
    // Should the widget be double buffered? Default is false.
    bool double_buffer;
    gfx::NativeView parent;
    // Specifies the initial bounds of the Widget. Default is empty, which means
    // the NativeWidget may specify a default size. If the parent is specified,
    // |bounds| is in the parent's coordinate system. If the parent is not
    // specified, it's in screen's global coordinate system.
    gfx::Rect bounds;
    // When set, this value is used as the Widget's NativeWidget implementation.
    // The Widget will not construct a default one. Default is NULL.
    NativeWidget* native_widget;
    // Aura-only. Provides a DesktopRootWindowHost implementation to use instead
    // of the default one.
    // TODO(beng): Figure out if there's a better way to expose this, e.g. get
    // rid of NW subclasses and do this all via message handling.
    DesktopRootWindowHost* desktop_root_window_host;
    // Whether this window is intended to be a toplevel window with no
    // attachment to any other window. (This may be a transient window is
    // |parent| is set.)
    bool top_level;
    // Only used by NativeWidgetAura. Specifies the type of layer for the
    // aura::Window. Default is LAYER_TEXTURED.
    ui::LayerType layer_type;
    // Only used by Aura. Provides a context window whose RootWindow is
    // consulted during widget creation to determine where in the Window
    // hierarchy this widget should be placed. (This is separate from |parent|;
    // if you pass a RootWindow to |parent|, your window will be parented to
    // |parent|. If you pass a RootWindow to |context|, we ask that RootWindow
    // where it wants your window placed.) NULL is not allowed if you are using
    // aura.
    gfx::NativeView context;
  };

  Widget();
  virtual ~Widget();

  // Creates a decorated window Widget with the specified properties.
  static Widget* CreateWindow(WidgetDelegate* delegate);
  static Widget* CreateWindowWithParent(WidgetDelegate* delegate,
                                        gfx::NativeWindow parent);
  static Widget* CreateWindowWithBounds(WidgetDelegate* delegate,
                                        const gfx::Rect& bounds);
  static Widget* CreateWindowWithParentAndBounds(WidgetDelegate* delegate,
                                                 gfx::NativeWindow parent,
                                                 const gfx::Rect& bounds);

  // Creates a decorated window Widget in the same desktop context as
  // |context|.
  static Widget* CreateWindowWithContext(WidgetDelegate* delegate,
                                         gfx::NativeView context);
  static Widget* CreateWindowWithContextAndBounds(WidgetDelegate* delegate,
                                                  gfx::NativeView context,
                                                  const gfx::Rect& bounds);


  // Enumerates all windows pertaining to us and notifies their
  // view hierarchies that the locale has changed.
  // TODO(beng): remove post-Aurafication of ChromeOS.
  static void NotifyLocaleChanged();

  // Closes all Widgets that aren't identified as "secondary widgets". Called
  // during application shutdown when the last non-secondary widget is closed.
  static void CloseAllSecondaryWidgets();

  // Converts a rectangle from one Widget's coordinate system to another's.
  // Returns false if the conversion couldn't be made, because either these two
  // Widgets do not have a common ancestor or they are not on the screen yet.
  // The value of |*rect| won't be changed when false is returned.
  static bool ConvertRect(const Widget* source,
                          const Widget* target,
                          gfx::Rect* rect);

  // Retrieves the Widget implementation associated with the given
  // NativeView or Window, or NULL if the supplied handle has no associated
  // Widget.
  static Widget* GetWidgetForNativeView(gfx::NativeView native_view);
  static Widget* GetWidgetForNativeWindow(gfx::NativeWindow native_window);

  // Retrieves the top level widget in a native view hierarchy
  // starting at |native_view|. Top level widget is a widget with TYPE_WINDOW,
  // TYPE_PANEL, TYPE_WINDOW_FRAMELESS, POPUP or MENU and has its own
  // focus manager. This may be itself if the |native_view| is top level,
  // or NULL if there is no toplevel in a native view hierarchy.
  static Widget* GetTopLevelWidgetForNativeView(gfx::NativeView native_view);

  // Returns all Widgets in |native_view|'s hierarchy, including itself if
  // it is one.
  static void GetAllChildWidgets(gfx::NativeView native_view,
                                 Widgets* children);

  // Re-parent a NativeView and notify all Widgets in |native_view|'s hierarchy
  // of the change.
  static void ReparentNativeView(gfx::NativeView native_view,
                                 gfx::NativeView new_parent);

  // Returns the preferred size of the contents view of this window based on
  // its localized size data. The width in cols is held in a localized string
  // resource identified by |col_resource_id|, the height in the same fashion.
  // TODO(beng): This should eventually live somewhere else, probably closer to
  //             ClientView.
  static int GetLocalizedContentsWidth(int col_resource_id);
  static int GetLocalizedContentsHeight(int row_resource_id);
  static gfx::Size GetLocalizedContentsSize(int col_resource_id,
                                            int row_resource_id);

  // Returns true if the specified type requires a NonClientView.
  static bool RequiresNonClientView(InitParams::Type type);

  void Init(const InitParams& params);

  // Returns the gfx::NativeView associated with this Widget.
  gfx::NativeView GetNativeView() const;

  // Returns the gfx::NativeWindow associated with this Widget. This may return
  // NULL on some platforms if the widget was created with a type other than
  // TYPE_WINDOW or TYPE_PANEL.
  gfx::NativeWindow GetNativeWindow() const;

  // Add/remove observer.
  void AddObserver(WidgetObserver* observer);
  void RemoveObserver(WidgetObserver* observer);
  bool HasObserver(WidgetObserver* observer);

  // Returns the accelerator given a command id. Returns false if there is
  // no accelerator associated with a given id, which is a common condition.
  virtual bool GetAccelerator(int cmd_id, ui::Accelerator* accelerator);

  // Forwarded from the RootView so that the widget can do any cleanup.
  void ViewHierarchyChanged(bool is_add, View* parent, View* child);

  // Performs any necessary cleanup and forwards to RootView.
  void NotifyNativeViewHierarchyChanged(bool attached,
                                        gfx::NativeView native_view);

  // Returns the top level widget in a hierarchy (see is_top_level() for
  // the definition of top level widget.) Will return NULL if called
  // before the widget is attached to the top level widget's hierarchy.
  Widget* GetTopLevelWidget();
  const Widget* GetTopLevelWidget() const;

  // Gets/Sets the WidgetDelegate.
  WidgetDelegate* widget_delegate() const { return widget_delegate_; }

  // Sets the specified view as the contents of this Widget. There can only
  // be one contents view child of this Widget's RootView. This view is sized to
  // fit the entire size of the RootView. The RootView takes ownership of this
  // View, unless it is set as not being parent-owned.
  void SetContentsView(View* view);
  View* GetContentsView();

  // Returns the bounds of the Widget in screen coordinates.
  gfx::Rect GetWindowBoundsInScreen() const;

  // Returns the bounds of the Widget's client area in screen coordinates.
  gfx::Rect GetClientAreaBoundsInScreen() const;

  // Retrieves the restored bounds for the window.
  gfx::Rect GetRestoredBounds() const;

  // Sizes and/or places the widget to the specified bounds, size or position.
  void SetBounds(const gfx::Rect& bounds);
  void SetSize(const gfx::Size& size);

  // Sizes the window to the specified size and centerizes it.
  void CenterWindow(const gfx::Size& size);

  // Like SetBounds(), but ensures the Widget is fully visible on screen,
  // resizing and/or repositioning as necessary. This is only useful for
  // non-child widgets.
  void SetBoundsConstrained(const gfx::Rect& bounds);

  // Sets whether animations that occur when visibility is changed are enabled.
  // Default is true.
  void SetVisibilityChangedAnimationsEnabled(bool value);

  // Starts a nested message loop that moves the window. This can be used to
  // start a window move operation from a mouse moved event. This returns when
  // the move completes. |drag_offset| is the offset from the top left corner
  // of the window to the point where the cursor is dragging, and is used to
  // offset the bounds of the window from the cursor.
  MoveLoopResult RunMoveLoop(const gfx::Vector2d& drag_offset);

  // Stops a previously started move loop. This is not immediate.
  void EndMoveLoop();

  // Places the widget in front of the specified widget in z-order.
  void StackAboveWidget(Widget* widget);
  void StackAbove(gfx::NativeView native_view);
  void StackAtTop();

  // Places the widget below the specified NativeView.
  void StackBelow(gfx::NativeView native_view);

  // Sets a shape on the widget. This takes ownership of shape.
  void SetShape(gfx::NativeRegion shape);

  // Hides the widget then closes it after a return to the message loop.
  virtual void Close();

  // TODO(beng): Move off public API.
  // Closes the widget immediately. Compare to |Close|. This will destroy the
  // window handle associated with this Widget, so should not be called from
  // any code that expects it to be valid beyond this call.
  void CloseNow();

  // Shows or hides the widget, without changing activation state.
  virtual void Show();
  void Hide();

  // Like Show(), but does not activate the window.
  void ShowInactive();

  // Activates the widget, assuming it already exists and is visible.
  void Activate();

  // Deactivates the widget, making the next window in the Z order the active
  // window.
  void Deactivate();

  // Returns whether the Widget is the currently active window.
  virtual bool IsActive() const;

  // Prevents the window from being rendered as deactivated. This state is
  // reset automatically as soon as the window becomes activated again. There is
  // no ability to control the state through this API as this leads to sync
  // problems.
  void DisableInactiveRendering();

  // Sets the widget to be on top of all other widgets in the windowing system.
  void SetAlwaysOnTop(bool on_top);

  // Maximizes/minimizes/restores the window.
  void Maximize();
  void Minimize();
  void Restore();

  // Whether or not the window is maximized or minimized.
  virtual bool IsMaximized() const;
  bool IsMinimized() const;

  // Accessors for fullscreen state.
  void SetFullscreen(bool fullscreen);
  bool IsFullscreen() const;

  // Sets the opacity of the widget. This may allow widgets behind the widget
  // in the Z-order to become visible, depending on the capabilities of the
  // underlying windowing system.
  void SetOpacity(unsigned char opacity);

  // Sets whether or not the window should show its frame as a "transient drag
  // frame" - slightly transparent and without the standard window controls.
  void SetUseDragFrame(bool use_drag_frame);

  // Flashes the frame of the window to draw attention to it. Currently only
  // implemented on Windows for non-Aura.
  void FlashFrame(bool flash);

  // Returns the View at the root of the View hierarchy contained by this
  // Widget.
  View* GetRootView();
  const View* GetRootView() const;

  // A secondary widget is one that is automatically closed (via Close()) when
  // all non-secondary widgets are closed.
  // Default is true.
  // TODO(beng): This is an ugly API, should be handled implicitly via
  //             transience.
  void set_is_secondary_widget(bool is_secondary_widget) {
    is_secondary_widget_ = is_secondary_widget;
  }
  bool is_secondary_widget() const { return is_secondary_widget_; }

  // Returns whether the Widget is visible to the user.
  virtual bool IsVisible() const;

  // Returns whether the Widget is customized for accessibility.
  bool IsAccessibleWidget() const;

  // Returns the ThemeProvider that provides theme resources for this Widget.
  virtual ui::ThemeProvider* GetThemeProvider() const;

  ui::NativeTheme* GetNativeTheme() {
    return const_cast<ui::NativeTheme*>(
        const_cast<const Widget*>(this)->GetNativeTheme());
  }
  const ui::NativeTheme* GetNativeTheme() const;

  // Returns the FocusManager for this widget.
  // Note that all widgets in a widget hierarchy share the same focus manager.
  FocusManager* GetFocusManager();
  const FocusManager* GetFocusManager() const;

  // Returns the InputMethod for this widget.
  // Note that all widgets in a widget hierarchy share the same input method.
  InputMethod* GetInputMethod();

  // Starts a drag operation for the specified view. This blocks until the drag
  // operation completes. |view| can be NULL.
  // If the view is non-NULL it can be accessed during the drag by calling
  // dragged_view(). If the view has not been deleted during the drag,
  // OnDragDone() is called on it. |location| is in the widget's coordinate
  // system.
  void RunShellDrag(View* view,
                    const ui::OSExchangeData& data,
                    const gfx::Point& location,
                    int operation,
                    ui::DragDropTypes::DragEventSource source);

  // Returns the view that requested the current drag operation via
  // RunShellDrag(), or NULL if there is no such view or drag operation.
  View* dragged_view() { return dragged_view_; }

  // Adds the specified |rect| in client area coordinates to the rectangle to be
  // redrawn.
  void SchedulePaintInRect(const gfx::Rect& rect);

  // Sets the currently visible cursor. If |cursor| is NULL, the cursor used
  // before the current is restored.
  void SetCursor(gfx::NativeCursor cursor);

  // Resets the last move flag so that we can go around the optimization
  // that disregards duplicate mouse moves when ending animation requires
  // a new hit-test to do some highlighting as in TabStrip::RemoveTabAnimation
  // to cause the close button to highlight.
  void ResetLastMouseMoveFlag();

  // Sets/Gets a native window property on the underlying native window object.
  // Returns NULL if the property does not exist. Setting the property value to
  // NULL removes the property.
  void SetNativeWindowProperty(const char* name, void* value);
  void* GetNativeWindowProperty(const char* name) const;

  // Tell the window to update its title from the delegate.
  void UpdateWindowTitle();

  // Tell the window to update its icon from the delegate.
  void UpdateWindowIcon();

  // Retrieves the focus traversable for this widget.
  FocusTraversable* GetFocusTraversable();

  // Notifies the view hierarchy contained in this widget that theme resources
  // changed.
  void ThemeChanged();

  // Notifies the view hierarchy contained in this widget that locale resources
  // changed.
  void LocaleChanged();

  void SetFocusTraversableParent(FocusTraversable* parent);
  void SetFocusTraversableParentView(View* parent_view);

  // Clear native focus set to the Widget's NativeWidget.
  void ClearNativeFocus();

  void set_frame_type(FrameType frame_type) { frame_type_ = frame_type; }
  FrameType frame_type() const { return frame_type_; }

  // Creates an appropriate NonClientFrameView for this widget. The
  // WidgetDelegate is given the first opportunity to create one, followed by
  // the NativeWidget implementation. If both return NULL, a default one is
  // created.
  virtual NonClientFrameView* CreateNonClientFrameView();

  // Whether we should be using a native frame.
  bool ShouldUseNativeFrame() const;

  // Forces the frame into the alternate frame type (custom or native) depending
  // on its current state.
  void DebugToggleFrameType();

  // Tell the window that something caused the frame type to change.
  void FrameTypeChanged();

  NonClientView* non_client_view() {
    return const_cast<NonClientView*>(
        const_cast<const Widget*>(this)->non_client_view());
  }
  const NonClientView* non_client_view() const {
    return non_client_view_;
  }

  ClientView* client_view() {
    return const_cast<ClientView*>(
        const_cast<const Widget*>(this)->client_view());
  }
  const ClientView* client_view() const {
    // non_client_view_ may be NULL, especially during creation.
    return non_client_view_ ? non_client_view_->client_view() : NULL;
  }

  const ui::Compositor* GetCompositor() const;
  ui::Compositor* GetCompositor();

  // Invokes method of same name on the NativeWidget.
  gfx::Vector2d CalculateOffsetToAncestorWithLayer(
      ui::Layer** layer_parent);

  // Invokes method of same name on the NativeWidget.
  void ReorderLayers();

  // Schedules an update to the root layers. The actual processing occurs when
  // GetRootLayers() is invoked.
  void UpdateRootLayers();

  // Notifies assistive technology that an accessibility event has
  // occurred on |view|, such as when the view is focused or when its
  // value changes. Pass true for |send_native_event| except for rare
  // cases where the view is a native control that's already sending a
  // native accessibility event and the duplicate event would cause
  // problems.
  void NotifyAccessibilityEvent(
      View* view,
      ui::AccessibilityTypes::Event event_type,
      bool send_native_event);

  const NativeWidget* native_widget() const;
  NativeWidget* native_widget();

  internal::NativeWidgetPrivate* native_widget_private() {
    return native_widget_;
  }
  const internal::NativeWidgetPrivate* native_widget_private() const {
    return native_widget_;
  }

  // Sets capture to the specified view. This makes it so that all mouse, touch
  // and gesture events go to |view|.
  void SetCapture(View* view);

  // Releases capture.
  void ReleaseCapture();

  // Returns true if the widget has capture.
  bool HasCapture();

  // Returns the current event being processed. If there are multiple events
  // being processed at the same time (e.g. one event triggers another event),
  // then the most recent event is returned. Returns NULL if no event is being
  // processed.
  const ui::Event* GetCurrentEvent();

  // Invoked when the tooltip text changes for the specified views.
  void TooltipTextChanged(View* view);

  // Sets-up the focus manager with the view that should have focus when the
  // window is shown the first time.  Returns true if the initial focus has been
  // set or the widget should not set the initial focus, or false if the caller
  // should set the initial focus (if any).
  bool SetInitialFocus();

  void set_focus_on_creation(bool focus_on_creation) {
    focus_on_creation_ = focus_on_creation;
  }

  // Returns a View* that any child Widgets backed by NativeWidgetViews
  // are added to.  The default implementation returns the contents view
  // if it exists and the root view otherwise.
  virtual View* GetChildViewParent();

  // True if the widget is considered top level widget. Top level widget
  // is a widget of TYPE_WINDOW, TYPE_PANEL, TYPE_WINDOW_FRAMELESS, BUBBLE,
  // POPUP or MENU, and has a focus manager and input method object associated
  // with it. TYPE_CONTROL and TYPE_TOOLTIP is not considered top level.
  bool is_top_level() const { return is_top_level_; }

  // Returns the work area bounds of the screen the Widget belongs to.
  gfx::Rect GetWorkAreaBoundsInScreen() const;

  // Notification that our owner is closing.
  // NOTE: this is not invoked for aura as it's currently not needed there.
  // Under aura menus close by way of activation getting reset when the owner
  // closes.
  virtual void OnOwnerClosing();

  // Overridden from NativeWidgetDelegate:
  virtual bool IsModal() const OVERRIDE;
  virtual bool IsDialogBox() const OVERRIDE;
  virtual bool CanActivate() const OVERRIDE;
  virtual bool IsInactiveRenderingDisabled() const OVERRIDE;
  virtual void EnableInactiveRendering() OVERRIDE;
  virtual void OnNativeWidgetActivationChanged(bool active) OVERRIDE;
  virtual void OnNativeFocus(gfx::NativeView old_focused_view) OVERRIDE;
  virtual void OnNativeBlur(gfx::NativeView new_focused_view) OVERRIDE;
  virtual void OnNativeWidgetVisibilityChanged(bool visible) OVERRIDE;
  virtual void OnNativeWidgetCreated() OVERRIDE;
  virtual void OnNativeWidgetDestroying() OVERRIDE;
  virtual void OnNativeWidgetDestroyed() OVERRIDE;
  virtual gfx::Size GetMinimumSize() OVERRIDE;
  virtual gfx::Size GetMaximumSize() OVERRIDE;
  virtual void OnNativeWidgetMove() OVERRIDE;
  virtual void OnNativeWidgetSizeChanged(const gfx::Size& new_size) OVERRIDE;
  virtual void OnNativeWidgetBeginUserBoundsChange() OVERRIDE;
  virtual void OnNativeWidgetEndUserBoundsChange() OVERRIDE;
  virtual bool HasFocusManager() const OVERRIDE;
  virtual bool OnNativeWidgetPaintAccelerated(
      const gfx::Rect& dirty_region) OVERRIDE;
  virtual void OnNativeWidgetPaint(gfx::Canvas* canvas) OVERRIDE;
  virtual int GetNonClientComponent(const gfx::Point& point) OVERRIDE;
  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
  virtual void OnMouseCaptureLost() OVERRIDE;
  virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
  virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
  virtual bool ExecuteCommand(int command_id) OVERRIDE;
  virtual InputMethod* GetInputMethodDirect() OVERRIDE;
  virtual const std::vector<ui::Layer*>& GetRootLayers() OVERRIDE;
  virtual bool HasHitTestMask() const OVERRIDE;
  virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE;
  virtual Widget* AsWidget() OVERRIDE;
  virtual const Widget* AsWidget() const OVERRIDE;

  // Overridden from FocusTraversable:
  virtual FocusSearch* GetFocusSearch() OVERRIDE;
  virtual FocusTraversable* GetFocusTraversableParent() OVERRIDE;
  virtual View* GetFocusTraversableParentView() OVERRIDE;

 protected:
  // Creates the RootView to be used within this Widget. Subclasses may override
  // to create custom RootViews that do specialized event processing.
  // TODO(beng): Investigate whether or not this is needed.
  virtual internal::RootView* CreateRootView();

  // Provided to allow the NativeWidget implementations to destroy the RootView
  // _before_ the focus manager/tooltip manager.
  // TODO(beng): remove once we fold those objects onto this one.
  void DestroyRootView();

 private:
  friend class NativeTextfieldViewsTest;
  friend class NativeComboboxViewsTest;
  friend class ScopedEvent;

  // Returns whether capture should be released on mouse release.
  virtual bool ShouldReleaseCaptureOnMouseReleased() const;

  // Sets the value of |disable_inactive_rendering_|. If the value changes,
  // both the NonClientView and WidgetDelegate are notified.
  void SetInactiveRenderingDisabled(bool value);

  // Persists the window's restored position and "show" state using the
  // window delegate.
  void SaveWindowPlacement();

  // Sizes and positions the window just after it is created.
  void SetInitialBounds(const gfx::Rect& bounds);

  // Sizes and positions the frameless window just after it is created.
  void SetInitialBoundsForFramelessWindow(const gfx::Rect& bounds);

  // Returns the bounds and "show" state from the delegate. Returns true if
  // the delegate wants to use a specified bounds.
  bool GetSavedWindowPlacement(gfx::Rect* bounds,
                               ui::WindowShowState* show_state);

  // Sets a different InputMethod instance to this widget. The instance
  // must not be initialized, the ownership will be assumed by the widget.
  // It's only for testing purpose.
  void ReplaceInputMethod(InputMethod* input_method);

  internal::NativeWidgetPrivate* native_widget_;

  ObserverList<WidgetObserver> observers_;

  // Non-owned pointer to the Widget's delegate.  May be NULL if no delegate is
  // being used.
  WidgetDelegate* widget_delegate_;

  // The root of the View hierarchy attached to this window.
  // WARNING: see warning in tooltip_manager_ for ordering dependencies with
  // this and tooltip_manager_.
  scoped_ptr<internal::RootView> root_view_;

  // The View that provides the non-client area of the window (title bar,
  // window controls, sizing borders etc). To use an implementation other than
  // the default, this class must be sub-classed and this value set to the
  // desired implementation before calling |InitWindow()|.
  NonClientView* non_client_view_;

  // The focus manager keeping track of focus for this Widget and any of its
  // children.  NULL for non top-level widgets.
  // WARNING: RootView's destructor calls into the FocusManager. As such, this
  // must be destroyed AFTER root_view_. This is enforced in DestroyRootView().
  scoped_ptr<FocusManager> focus_manager_;

  // A theme provider to use when no other theme provider is specified.
  scoped_ptr<DefaultThemeProvider> default_theme_provider_;

  // Valid for the lifetime of RunShellDrag(), indicates the view the drag
  // started from.
  View* dragged_view_;

  // The event stack.
  std::stack<ScopedEvent*> event_stack_;

  // See class documentation for Widget above for a note about ownership.
  InitParams::Ownership ownership_;

  // See set_is_secondary_widget().
  bool is_secondary_widget_;

  // The current frame type in use by this window. Defaults to
  // FRAME_TYPE_DEFAULT.
  FrameType frame_type_;

  // True when the window should be rendered as active, regardless of whether
  // or not it actually is.
  bool disable_inactive_rendering_;

  // Set to true if the widget is in the process of closing.
  bool widget_closed_;

  // The saved "show" state for this window. See note in SetInitialBounds
  // that explains why we save this.
  ui::WindowShowState saved_show_state_;

  // The restored bounds used for the initial show. This is only used if
  // |saved_show_state_| is maximized.
  gfx::Rect initial_restored_bounds_;

  // Focus is automatically set to the view provided by the delegate
  // when the widget is shown. Set this value to false to override
  // initial focus for the widget.
  bool focus_on_creation_;

  scoped_ptr<InputMethod> input_method_;

  // See |is_top_level()| accessor.
  bool is_top_level_;

  // Tracks whether native widget has been initialized.
  bool native_widget_initialized_;

  // Whether native widget has been destroyed.
  bool native_widget_destroyed_;

  // TODO(beng): Remove NativeWidgetGtk's dependence on these:
  // If true, the mouse is currently down.
  bool is_mouse_button_pressed_;

  // If true, a touch device is currently down.
  bool is_touch_down_;

  // TODO(beng): Remove NativeWidgetGtk's dependence on these:
  // The following are used to detect duplicate mouse move events and not
  // deliver them. Displaying a window may result in the system generating
  // duplicate move events even though the mouse hasn't moved.
  bool last_mouse_event_was_move_;
  gfx::Point last_mouse_event_position_;

  // See description in GetRootLayers().
  std::vector<ui::Layer*> root_layers_;

  // Is |root_layers_| out of date?
  bool root_layers_dirty_;

  DISALLOW_COPY_AND_ASSIGN(Widget);
};

}  // namespace views

#endif  // UI_VIEWS_WIDGET_WIDGET_H_
